Very poor service from apple regarding iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program
I experienced the problem 22 december with my Imac display turned white with vertical lines all over the screen. The error was continues on the 22 - 23 and so I decided to contact my dealer on the 23 and report that something was wrong.
My local dealer then took the machine in for diagnostics/troubleshooting and they had it more then 2 weeks, and were never able to get the error message via the apple test, which had to register the error for this: http://support.apple.com/kb/TS5167 to take effect
The technician then asked me if I could try to take the Imac home and see if the error would come again and if possible document the error!!
I took the Imac home again and same evening I managed to get excactly the same error that was plauging me prior to them trying to test the machine, but this time I recorded the errors and put them on youtube for the technician to see:
https://www.youtube.com/watch?v=iZQhoCpcw5w&list=PLCmKS0JBg_VMJpqy00j8cQ8O1wPx0v gfL&index=1
https://www.youtube.com/watch?v=A1_QrQdg5-w&list=PLCmKS0JBg_VMJpqy00j8cQ8O1wPx0v gfL
https://www.youtube.com/watch?v=Hh_UXJO6BrM
I have had atleast more then 200 of those errors since 22 december but now after the last one in the list there the GFX card has simply broken down and Apple refuse to accept that the card has been faulty regarding this: http://support.apple.com/kb/TS5167 replacement program and they refuse to accept that those errors I am getting are any part of that program, because their test cannot find the error which seems to be periodic.
This whole situation has been very frustrating and I hope that if there are others out there with this problem, then they can recognize my torment with this and come with a solution of how they have done.
iMac, OS X Mavericks (10.9.1)